Several races have been reported connected with the allocation, referencing and destruction of mapped devices which can lead to crashes. This set of patches tightens up the code.
committed in stream U4 build 34.26. A test kernel with this patch is available from http://people.redhat.com/~jbaron/rhel4/
Patch is in 40.1.EL, setting verified as there doesn't appear to be a test case for this.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2006-0575.html